医生精确定位了病人疼痛的来源。

The doctor succeeded in ___pinpointing the source of the patient's pain.

医生花了很长时间才找出他头痛的确切原因。

The doctor spent a long time ___pinpointing the exact cause of his headache.

科学家们准确地定位了地震的震中。

The scientists succeeded in ___pinpointing the exact epicenter of the earthquake.